Malicious PDF — malware analysis report

Static analysis result for SHA-256 5487f9e7a42dd367…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 08:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a7c7e2c6e84fb5b18011bbd2ece2f94 SHA-1: 7ccbf52c4efb1d60c06c249f3e35ce6e9a76275e SHA-256: 5487f9e7a42dd3671be27a9b8581fd49aa34d29fb05d2c23401d8e0277b960d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=payment+of+wages+act+1948 PDF link annotation
    • http://esejsc.com/upload/files/golana.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/sivadomem.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/42296077463.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/33411553437.pdfIn PDF document text
    • http://babamoleskine.com/files/file/75638031847.pdfIn PDF document text
    • http://waypl.pl/upload/File/lomosematovaf.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdf3aa388---vaxilimivadera.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pafupifiraforemirilew.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b312f4ca71---giwiferebanad.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3ae29f25053f9d9604493cfdfcdeb085/86316243855.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/labukotogije.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/26057400702.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/junedosujobixemafe.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/wubudif.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/8824195220.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088749aa2532---bugelumob.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/6960080784.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/51434631131.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bagawigizibukuvabelozo.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/gabovolorewofirivu.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/jezogepagifukeruzanimi.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vupojarofadi.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/bakopimetewoxukati.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 16988 bytes
SHA-256: 34a6c466e49682ec9db546f64cd4fc1f9f7a486e9bd733fd969ee011154b1c8b
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 11148 bytes
SHA-256: 28f4cfd4c77f4f90e20118cc528fa658f80df048263ea181c4bbf5adca690b61

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